Answer:
(A) Many crops would die because irrigation water would be limited
You're welcome. ^_^
Answer:
By collecting runoff during the rainy season much of the land degredation caused by water erosion is prevented.
Explanation:
On USA test Prep this would be option D.
Darwin believed that all organisms were created simultaneously by the force of nature.
Darwin believed that all organisms have descended from two different ancestors.
Answer:
Option B, Darwin believed that all organisms were created simultaneously by the force of nature.
Explanation:
pharynx
nose
trachea
The correct answer is alveoli.
At the end of the respiratory tree, alveoli are located. These are tiny, balloon-shaped air sacs are arranged in clusters throughout the lungs. these are the site of gaseous exchange as alveoli are surrounded by thin pulmonary capillaries which allows exchange of gases. The oxygen diffuse into the blood capillaries and the carbon dioxide diffused into the alveolar space from the blood capillaries.
B) filtration.
C) active transport.
D) passive transport
Answer:
D) passive transport
Explanation:
Passive transport is the movements of molecules or ions from the region of its higher concentration to its lower concentration or along the concentration gradient. Since passive transport occurs along the concentration gradient, no energy input is required in the process. An example of passive transport is simple diffusion or facilitated diffusion.
Substances like oxygen pass through the cell without the use of energy and move from an area of high concentration to an area of low concentration that occurs during passive transport.
Further Explanation:
Every molecules that passes across the cell has to cross the cell membrane barrier. The cell membrane is mainly made up of lipid bilayer which allows the hydrophobic molecules to pass throughit and restricts the entrance of hydrophilic molecules. It also allows the uncharged molecules to pass through the cell by simple diffusionand restricts the passage of charged molecules.
There occurs two basic type of transport-
Passive transport is the type of transport wherein energy is not required for movement of molecules across the cell. During this type of transport the molecules moves from high concentration gradient to low concentration gradient.
The oxygen is an uncharged molecule that can easily pass through the cell from high concentration to low concentration without the expenditure of energy. In the active transport the molecules moves from low concentration gradient to high concentration gradient which requires energy in the form of ATP.
Osmosis is specifically used for the transport of water molecule from high concentration to low concentration gradient.
Learn more:
Answer Details:
Grade: College Biology
Subject: Biology
Chapter: Cell membrane
Keywords:
Cell membrane, lipid bilayer, hydrophilic molecule, hydrophobic molecule, active transport, passive transport, diffusion, osmosis, ATP, concentration gradient, charged molecule, uncharged molecules.
N
Ne
IM
Na Ma
K
Cr Mn Fe Co Ni Cul En Ga Ge As BK
ca
ST
A. PRO
G. Hech
Deo